Feed-water heater



(No Model.)

P. ROHAN.

FEED WATER HEATER. No. 394,137. Patented Deo. 4, 1888.

Nv PETERS. PhnxvLmmgmpher, waumngxan. D l;

UNITED STATES PATENT OEEieE.

PHILIP ROHAN, OF ST. LOUIS, MISSOURI.

FEED-WATER HEATER.

SPECIFICATION forming part. of Letters Patent No. 394,137, dated December 4, 1888.

Application filed May 28, 1888.

To LIZ whom it may concern.'

Be it known that I, PHILIP ROHAN, a citi- Zell oi' the United States, residillg at St. Louis, ill the State oi Missouri, have illvellied ceriaill new alld useiul Illlprovelllellis ill FeedlVater lleaters and Filters, ot' wllicll ille following is such a i'ull, clear, and exact descripiion as will ellable any one skilled ill ille art l to which ii. appertains io lllake alld use ille saine, reference beillg had to ille accolnpany-l ing drawing, i'orllling part oi' illis specificaiioll.

llle object ot llly illventioll is to increase ille ielllperlliure at wllicll i't-led-water is il'ltered prior to iis delivery io ille boiler, alld also to retilter ille water aiicr it llas beell illtrod need Vinto ille boiler, alld io nlainiaill ille temperature oi' ille water drawll irolll ille boiler by exhaust-steam, so lthat its telllperature will notI be lowered io sucll a degree illat it will abstract use'lul heat ironl ille boiler.

The invention also has for iis object lleaiine,` the ieed-waim' by exllallst-stealll to ei't'eci. ecollollly.

I anl aware that ii is not. broadly llew io reiilter tllewater at'ter itis delivered to ille boiler, and do not clailll such as llly invention.

The invention consists ot a belier which receives its heat trolll eXllatlst-siealll, through which heater ille water is forced by a pulllp, and is then delivered to a ll'lter located witllill the heater, through which iilter ille water passes ilo ille boiler, so that ille tel'llperaiure of the water is lllainiailled wllile passing through ille iilier alld no heat lost by radiaiioll. At ille point where ille feed-water is received into said lilter a eolllleciioll is nlade Connection illai, ille filter being` jacket ed and enveloped by ille heater, which is supplied with exhaust-steam, ille water takell fronl the boiler is lllailltailled very near its boiler temperature, no great anlonnt of heat being,` lost by repassing ille water through the iilter,

Serial No. 275,344. (No model.)

which feature is an illlprovenlent over any refilteringI apparatus now ill use alld constitutes one ot ille principal poillisot' nly inventioll.

I will describe nly invention ill detail by referring to ille accompanying drawing, ill wllicll a portion otl a steam-boiler is shown wiill a heater and lilter applied-in accordance with llly invention.

In all application iled by lne on ille 17th day ot' lllarcll, '1888, Serial No. 207,451, I have described a ii lier and llcater substantially like ille one herein shown; but ill ille present illstance l have lllade a solllewllat dit't'erent applicatioll ot said filter and heater.

l is a pulllp, which i'orees ille feed-water through a coil of pipe, 2, which is sllrroullded by a jacket, il, having ports l- 5, through wllicll exhaust siealll is enlitted and discharged. The water passes through ille coil 2, alld is heated by exhaust siealll io 2120. Fronl said coil it passes illto a scitling-chandler, il', wlliell is arranged above ille filtering or coke cllanlber 7, arranged within ille coil and surrounded by ille jacket: 23, so tllaiille ienlperature oi` the water while being flliered is lllailliailled by exllausi-stealll. The water passes through said coke-challlberalld elllerges fronl the iilter by nleans oi` a pipe, S, which carries tlle water to ille boiler 9.

The nlnd-drulll 10 ot the boiler is connected by a pipe, ll, to a second or hot-water pulllp,

Yforces it through ille pipe i3, which joins ille coil i? and passes illto tlle seitlillg-cllalnber 6 wiill it. At ille point it ille hot water `fronl ille boiler and ille heated feed-water Colnlningle alld pass illto the settling-chamber, taking the course lllapped ont above. In the drawing the arrows show the direction ill wllicll ille circulation takes place. I have represented ill said drawing,` the teed-waier by arrows llavillg a Vfull barb or iail, alld ille hot. water frolll ille boiler by arrows having llo barb, alld the conlnlingled feed-waiter and boiler-water are represented by arrows llavingI but halt ot' a barb, so that ille circulation ill the different pipes can be easily distinguished ill ille drawing. Illen tlle water frolll the coil encounters tlle water from the boiler, it` is heated well nigh io boiler ielllpera- 1;?, which draws ille water irolll the boiler and IOO ture. hundred pounds, the commingled feed and boiler water, when it reaches the settlingehamber ti before being filtered, will be not far from 335, at which temperature eightyseven per cent. of the foreign matter in the water is rendered fiocculent, and seven per cent. thereof is vaporized, so that by filtering the Water at such an increased temperature nearly all of the foreign matter is arrested before passing into the boiler. My invention possesses the advantage of filtering water at such a high temperature, and thereby delivering' it to the boiler almost pure, and it has also the further advantage of refiltering the water of the boiler and keeping its temperature from falling materially by exhaust -steam which surrounds the filter, so that should any scale start to form in the boiler, or any matter held in suspension or solution be thrown down after the filtered water (which is almost pure) is delivered to the boiler, it will be redrawn from the boiler and filtered anew. It will be seen, therefore, that boilers provided with my improved heater and filter will run very little chance of being incrusted. lncrustation of boilers, as is well known, greatly diminishes their efficiency, and often. causes explosions, or causes boilers to be damaged by the overheating of the plates thereof.

The pumps 1 and 12 are preferably worked by the same steam-cylinder-that is to say, they form a duplex pump. Between the coldwater pump 1 and the coil is placed a cock, 15, by which the amount of feed-water may be regulated.

16 is also a cock located in the pipe 8, by which the supply of water to the boiler is controlled.

17 and 1S are cocks placed on each side of the hot-water pump 12 in the pipes 13 and 1l, respectively, so to regulate the amount of water drawn from the boiler. By closing the cock 15 and opening the cocks 17 and 1S, the water of the boiler can be refiltered without being mixed with the feed-water. This might be necessary to be done now and then, so as to set up a strong circulation in the boiler and to refilter the boiler-water rapidly to prevent the formation of any scale in the boiler. An advantage will here be noted in my invention over others, that when so withdrawing the water from the boiler and passing it through the filter I maintain its temperature by means of exhaust-steam, (a waste product,) which effects great economy and practically wastes none of the boiler heat. So, too, by closing the valves 17 and 18 and opening the valve 15, the refiltering can be prevented, if desired, and a greater quantity of feed-water supplied to the boiler. By adjusting these valves the quantity of cold and hot water circulating in the apparatus can be regulated at will.

19 is a valve, which is connected to the upper part of the settling-chamber 6, by which the scum may be blown off of the water.

20 is a blow-off cock, which is used to blow lf the pressure in the boiler be one,

off the sediment from the settling-chamber (i.

`lt will be noted that when the exhauststeam comes in contact with the cold-water coil 2 the steam will be condensed and the back-pressure on the engine will be relieved, S0 that the double purpose of heating the feed-water and relieving the back-pressure is subserved.

It will be obvious to those skilled in the art that various changes may be made and still be within the scope of my invention. I do not, therefore, wish to confine myself to the eXact arrangement and position of parts described. v

That l desire to claim and secure by Letters Patent of the United States as my invention isl. The combination, to form a feed-water heating and filtering apparatus, of a coil of pipe through which the feed- 'atei' is forced, a heater therefor supplied by exhaust-steam, a settling-chamber and filter into which said coil opens, a hot-water connection from the boiler to said settling-chamber, through which water is drawn from the boiler and forced into said' settling-chamber, and a pipe connecting the other end of said filter with the boiler, whereby the feed-water is heated before coming in contact with the water drawn from the boiler, and the commingled water is :filtered at its highest temperature before it is delivered to the boiler, for the purpose described.

2. The combination of a coil of pipe through which feed-water is forced, a jacket, 3, surrounding the same, into which exhauststeam is admitted to heat the feed-water circulating in said coil, a filtering-chamber, to which said coil is connected, located within said coil and jacket, a hot-water connection with the boiler, through which hot water is drawn from the boiler and delivered to said filter, and a pipe connecting the other end of said filter with the boiler, whereby the feedwater is heated before coming in contact with the water drawn from the boiler, and the commingled water is filtered at its highest temperature, and the temperature thereof is maintained while passing through the filter, for the purpose described.

3. A feed-water heater consisting of a coil of pipe, a cold-water pump for forcing the feed-water through said coil of pipe into the boiler, and a jacket surrounding said coil of pipe, into which exhaust-steam from the engine is discharged, whereby the feed-water is heated by said exhaust-steam and the backpressure of the engine is relieved by the condensation caused by said coil of pipe.

et. The combination, as hereinbefore set forth, of the boiler, as 9, the pipe 11, connected with its mud-drum, a duplex pump having a hot-water chamber, by which the water is drawn from the boiler thro ugh said pipe 11, a pipe, 13, connected with the hot-water chamber of said pump and leading to settlingchamber 6, a feed-water pipe, a cold-water chamber of said duplex pump forcing said IOO IIO

feed-Water through the Coil of pipe, as 2, also connected to the setiling-ehzunber G, a jacket, 3, surrounding Suid eoil of pipe, into which exhaust-Steam is diseliarged, a filter Surrounded by Suid coil and jacket located below Said Settling-Chamber, and ft boiler-connecting pipe, S, opening' inio The other end of Said filter.

5. The combination, as hereinbofore Set forth, of the boiler, as f), t pipe, 11, connected with its mud-drum, fr duplex pump hm'ing a` hot-Waiter ehzunber, by which the Water is drawn from The boiler through Suid pipe 11, 2t pipe, 12S, connected with the hot-Water chiunber ot' Suid pump and leading' to a settlingeliz111iber,b,a` feed-water pipe, ai. cold-water chamber of Said duplex pump forcing said feed-water through u coil of pipe, as 2, e011- neeted to the settling-ehmnber U, a jacket, 3, surrounding' said coil of pipe, into which eX- hauSt-stezun is discharged, a filter surrounded by Said coil und jacket located below Suid settling-ehmnber, a boiler-eonneeting;` pipe, S, opening' into the other end oi' Said filter, and the cocks 15, 1G, 17, and 18,1oezlted in said pipes, as described.

In testimony whereof I have hereunto Set my hand and afiixeil my Seal this 213th dayof May, 1SSS,n presence of the two Subserib ing witnesses.

PHILIP ROHAN. [L 55.]

\Vitnesses:

A. C. 'I1`oWLER, M. S. REEDER. 

